DNS leak

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I set my comodo firewall to these settings: https://airvpn.org/topic/3405-windows-comodo-prevent-leaks/

 

I'm still failing the DNS leak test.  I'm really lost at what to try next.  Is my comcast modem redirecting my DNS requests no matter what i do? 

 

i tried some other things:

flushed dns cache

disabled ipv6

disabled teredo

set DNS servers to AirVPN DNS servers in the adapter setting

read read and read

 

I've been spending way too much time on this problem.  I could sure use some help.